EP 1382571 B1 20051228 - Method for producing iron hydroxide, hydrated iron oxide and iron oxide from filter salts obtained by the recovery of waste acids
Title (en)
Method for producing iron hydroxide, hydrated iron oxide and iron oxide from filter salts obtained by the recovery of waste acids
Title (de)
Verfahren zur Herstellung von Eisenhydroxid, Eisenoxidhydrat oder Eisenoxid aus Filtersalzen der Dünnsäurerückgewinnung
Title (fr)
Procédé de préparation de l'hydroxyde de fer, de l'oxyde de fer hydraté et de l'oxyde de fer à partir de sels filtrés obtenus par la récupération d'acides résiduels
Publication
Application
Priority
DE 10232069 A 20020716
Abstract (en)
[origin: EP1382571A1] Recovery of iron hydroxide (IA), hydrated oxide (IB) or oxide (IC) from filter salts (II) from dilute acid recovery comprises dissolving (II) in water, adjusting the solution to pH below 1 and then to pH 2-4 by adding a strong base, with stirring; separating the precipitate as usual; adjusting the solution to pH 6-8 by adding a strong base and/or oxidant, separating precipitated (IA) or (IB), washing and drying and optionally drying and/or calcining to (IC).
IPC 1-7
IPC 8 full level
C01G 49/02 (2006.01); C01G 49/06 (2006.01)
CPC (source: EP US)
C01G 49/02 (2013.01 - EP US); C01G 49/06 (2013.01 - EP US); Y10S 423/01 (2013.01 - EP US); Y10S 423/02 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FR GB
DOCDB simple family (publication)
EP 1382571 A1 20040121; EP 1382571 B1 20051228; DE 10232069 A1 20040205; DE 50302037 D1 20060202; JP 2004051477 A 20040219; US 2005019250 A1 20050127; US 7144561 B2 20061205
DOCDB simple family (application)
EP 03015714 A 20030709; DE 10232069 A 20020716; DE 50302037 T 20030709; JP 2003196654 A 20030714; US 74569303 A 20030708